will someone please explain to me the differences between the Zero line and the EZE/TM2

is the Zero softer and more flexible?
which would you use in winter and why? (and by winter I mean Canadian winter where we have snow and it actually gets cold...not this nancy boy southern states winter that's actually like a Canadian summer)*

They seem very close to me. IMO the ZERO has a more rubbery feel. I'd normally say use that in Winter, but since it is discontinued you may be better just using EZE. I think they are close enough in most cases to be interchangeable. EZE just takes a little break in time to feel good.

This is what happened to my T.M. River, and it took a huge chunk out of it at the same time That coupled with the feel of the plastic when it was new is why I don't really like the first run all that much.

"Eze Line was used during 2012 and the plan was that it would replace Zero Line. We have not been satisfied with the outcome of some of the discs so production in Eze Line material will be put on hold. During 2013 the premium putter plastic used in Zero Line will be back on the shelves."

"Zero Line is the soft grippy putter plastic used in our putters and approach discs. The plastic is chosen because of the good grip and feel. The feel you need in your short game! We have received much demand for softer Zero Line discs, so we will make an effort to deliver that during 2013."